2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/82624Contents: 1. Introduction 2. Operator Product Expansion for Quarkonium Interactions 3. Scale Anomaly, Chiral Symmetry and Low-Energy Theorems 4. Quarkonium Interactions in Matter 5. Conclusions and Outlook28 pages, LaTeX file, no figures; to appear in The Proceedings of the Enrico Fermi International School of Physics on "Selected Topics in Non-Perturbative QCD", Varenna, Italy, June 1995Nuclear TheoryHigh Energy Physics - Phenomenologytext